Antifriction properties

Excellent antifriction properties and good hardness (qv) make lead—antimony—tin alloys suitable for journal bearings. The alloys contain 9—15 wt % antimony and 1—20 wt % tin and may also contain copper and arsenic, which improve compression, fatigue, and creep strength important in bearings. Lead—antimony—tin bearing alloys are Hsted in ASTM B23-92 (7). 

More recendy, molecular molybdenum-sulfur complexes and clusters have been used as soluble precursors for M0S2 in the formulation of lubricating oils for a variety of appHcations (70). Presumably, the oil-soluble molybdenum—sulfur-containing precursors decompose under shear, pressure, or temperature stress at the wear surface to give beneficial coatings. In several cases it has been shown that the soluble precursors are trifunctional in that they not only display antifriction properties, but have antiwear and antioxidant characteristics as weU. In most cases, the ligands for the Mo are of the 1,1-dithiolate type, including dithiocarbamates, dithiophosphates, and xanthates (55,71). 

Hydraulic Fluids and Lubricants. The use of borate esters in hydrauHc fluids (qv) and lubricants (see Lubrication and lubricants) has been described in numerous patents (40,43,44). A variety of borate esters have been described that can be used as multiflinctional lubricant additives having antiwear and antifriction properties (45). 

Containing up to 3% silicon, silicon bronzes are characterized by high mechanical and antifriction properties. They are made in all wrought forms. 

Siloxane containing polyester, poly(alkylene oxide) and polystyrene type copolymers have been used to improve the heat resistance, lubricity and flow properties of epoxy resin powder coatings 43). Thermally stable polyester-polysiloxane segmented copolymers have been shown to improve the flow, antifriction properties and scratch resistance of acrylic based auto repair lacquers 408). Organohydroxy-terminated siloxanes are also effective internal mold release agents in polyurethane reaction injection molding processes 409). 

With respect to screw geometry, we turn back the clock to Wolfen, where the team was searching for the perfect mechanical apparatus for high-viscosity technology. It had to function despite the adhesive, frictional, and antifrictional properties of the product, cope with various material consistencies, and overcome rheological changes caused, for instance, by reactions in the machine. 

Maphos . [PPO/SpecialtyChem.] Rios- ate esters lubricant with anticono-sive/antifrictional properties textile wetting agent hard surface detergent dispersant hydrotrope, solubilizer, enmlsifier. 

Vinylidene Fluoride Hexafluoropropylene Copolymer - Thermoplastic copolymer of vinylidene fluoride and hexafluoropropylene. Has better thermal stability, antistick, dielectric, and antifriction properties, and chemical resistance, but lower mechanical strength at room temperature and creep resistance, compared to incompletely fluorinated fluoropolymers. Processing by conventional thermoplastic techniques is difficult due to its high melt viscosity. Uses include chemical apparatus, containers, films, and coatings. Also called TAM... 

EINECS 246-614-4 Isooctyl phosphite ((C8H170)3P) Phosphorous acid, triisooctyl ester Triisooctyl phosphite Weston TIOP. Intermediate insecticides lubricant additive specialty solvents stabilizer for acrylics, nylon, unsaturated polyester, PVC improves antiwear and antifriction properties. Stabilizer tor hot-melt adhesives. PU, polyesters used in molding, extrusion, and film applications in PP, HOPE, LDPE, PVC, and polyesters also useful for PP fiber applications and calendering of PVC. Oil d = 0.891. Albright i Wilson Americas Inc. GE Specialities Stave. 

As can be seen, introduction of FO into the lubricant composition improves adhesive and the antifrictional properties of the lubricating layer. 

V.V. Korshak, LA. Gribova, A.P. Krasnov, et al. Antifriction properties and wear resistance of plastics based on cross-linked polyphenylquinoxahne. Soviet... 

Polyamides Thermoplastic aromatic or aliphatic polymer of dicarboxylic acids and diamines, of amino acids, or of lactams. Has good mechanical properties, chemical resistance, and antifriction properties. Processed by extrusion and molding. Used in fibers and molded parts. Also called PA. 

Nylon 6 is known to have a low coefficient of friction and high wear resistance, while polystyrene, in contrast, has poor antifriction properties. The experimental data suggest that, since the coefficient of friction of the grafts (at least for polystyrene contents up to 33 %) is essentially equal to that of the nylon, nylon 6 must make up the continuous phase. 

Up to 5% lead may be added to improve pressure tightness, ease of casting and machining, and antifriction properties. 

The antifriction properties of graphite can be illustrated by sliding a block of metal across a surface plate. Now sprinkle some shavings from... 

Until now, the technical progress in many fields of industry, especially in engineering industry, instrument production, was circiunfused namely by the use of constructional plastics. Such exploitation properties of polymers as durability, thermal stability, electroisolation, antifriction properties, optical transparency and others determine their usage instead of ferrous and nonferrous metals, alloys, wood, ceramics and glass [13]. 1 ton of polymers replace 5-6 tons of ferrous and nonferrous metals and 3-3.5... 

In blends, fluoropolymers are used in small quantities to enhance throughput, reduce the frictional properties, and increase the wear resistance. Blends comprising 0.3-50 wt% of a low molecular weight PTFE (T , < 350 °C) with engineering resin showed improved antifriction properties (Asai et al. 1991). LLDPE generally exhibits sharkskin melt fracture, but the use of fluoropolymer additives, such as the copolymer of vinyUdene fluoride and hexafluoropropylene, can help to eliminate the extrusion instability (Hatzikiriakos and Migler 2005). 

However, the further expansion of areas of their application attributes to the creation of new, more perfect compounds with required operational characteristics such, as electric and heat conductivity at high indicators of physic mechanical and antifriction properties. 

Thus, as a result of the lead researches the new method of obtaining of graphite feeling polyhydroxiethers with high parameters of adhesion to various surfaces, electrical conductivity, physic-mechanical and antifriction properties is offered. 

The antifriction properties of graphite can be illustrated by sliding a block of metal across a surface plate. Now sprinkle some shavings from a pencil lead containing graphite on the surface plate and again slide the block across the surface. It will now slide very much more easily. 

The metal also finds appHcations in other alloys. Cable sheaths are made of lead that contains antimony, and lead shot for ammunition is not made of pure lead but of lead alloyed with 1-8% antimony. The American Isaac Babbitt (1798-1862) invented the bearing alloy named babbitt metal. It is an alloy of copper, antimony and tin, characterized by good antifriction properties, and used as the bearing material for axles and crankshafts. Britannia metal is another tin alloy with about 2% copper and 5-10% antimony. It is a silvery white alloy of tin, similar in appearance to pewter but harder. It is used for the manufacture of tableware. 

The application of such chelates as the metal phthalocyanines increases the thermal stability and improves the antifriction properties of the epoxy polymers [3,292-294]. 

New block and graft copolymers (Dipron) with good abrasion and heat resistance and good antifriction properties have been prepared in the USSR by coextrusion of polyethylene and polyamides [131]. Coextrusion has also been used to modify the relatively low impact strength at low temperature of polypropylene. A mixture of polypropylene and polyethylene has been processed at different conditions. The resulting materials have been compared to block copolymer produced by copolymerization [132]. The proper-... 

From these results, an ideal ER particle should have a sufficiently high electrical conductivity within the particle in order to obtain high polarization. Because the particle does not charge near the surface, minimal current will pass between particles. It is also desirable to have minimum particle size without sacrifice to the ER effect, uniform internal structure with low time variation, good antifriction properties, and appropriate hardness to avoid electrode abrasion. 

In a similar way the same kind of study was performed with IF-WS2. The optimal concentration of IF-WS2 in PAO was first determined. The same tendency as with IF-M0S2 is observed. The friction coefficient decreases when the IF-WS2 concentration in oil increases. The lowest friction is obtained with a concentration of 1 wt%, for which a value of 0.04 is reached (Figure 2.20). Whatever the concentrations, the friction coefficient is low and stable from the first cycles [53]. Pure PAO presents antifriction properties after 200 cycles, which is still not explained. 

---